To solve this problem, we can use the principle of inclusion-exclusion. First, we know that the number of students who studied in either the library or the student union is:
70 + 57 = 127.
However, this counts the 21 students who studied in both the library and the student union twice. So we need to subtract this number from the total:
127 - 21 = 106.
Therefore, there are 106 students who studied in either the library or the student union, but not both.
A college survey was taken to determine where students study. Of 118 students surveyed , 70 studied in the library , 57 studied in the student union , 21 studied in both the library and the student union .
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